It’s been five years since Wreck appeared on Alternative Tentacles. So what have Unsane been doing in the intervening period? Gazing at their navels, taking up yoga and discovering a serene spirituality as a means of dealing with the anguish of life in the modern world? As if. They’ve been distilling their brutal rage into even more intensely bleak slabs of sonic nihilism. And, naturally, it’s housed in appropriately unsubtle, gore-soaked artwork. Unsane’s album covers are nothing if not distinct: while so many metal album covers which display hematomaniac tendencies are highly stylised and revel in the intended shock value, Unsane’s covers are all the more shocking by view of their clinicality, resembling crime scene photos than works of art. This is in many ways true of the music itself: there’s a functionality, a bluntness about it, and no sense of there being any indulgence or show.

Everything about Sterilize is stark, uncompromising, and connotes post-industrial, post-everything society, the dehumanising effects of merely trying to exist in the capitalist world where everyone gets pushed further and further down for the benefit of the few. It’s the soundtrack to life being sucked from the soul, the sonic encapsulation of desolate fury.

The grey steel assault of ‘Factory’ sets the tone and tempo: screeching feedback whistles through the grey, grain of the guitars and sludgy bass. From thereon in, the ferocious howls of anguish and packed in tight, back-to-back.

The song titles are also functional, direct, descriptive. Again, there’s no fluff, and little joy, to be found around ‘We’re Fucked’, ‘A Slow Reaction’ or ‘Distance’. Everything is paired back to the bare essentials and compacted for maximum impact. This includes the blues-based sound that defines Unsane: it’s crunched up, compressed, stomped into submission, meaning that while there is a certain swing to it, it’s limited to the most concise and precise form.

‘The Grind’ is aptly titled and brings a thunderous deluge of guitar; ‘Aberration’ is built around a simple four-chord trudge; and ‘No Reprieve’ sums up the album as a whole. You don’t listen to Unsane for variety, either across a given album, or their output overall. You listen to Unsane to vent, to experience a relentless viscerality. There’s something almost self-flagellatory about listening to an Unsane album in its entirety. At a certain point, the initial sense of catharsis is replaced by a crushing claustrophobia. This isn’t to say it’s an unpleasant experience, but is indicative of the effect of such sustained intensity. It’s as exhausting, mentally and physically, as the exertions of daily life on the treadmill, a punishment as reward.

When they slow the pace a shade, the weight is turned up, and when they hit a groove, it’s explosive and blistering. The tripwire guitar that stretches its sinews over the sludgy trudge of ‘Lung’ only raises the tension, and closer ‘Avail’ draws a heavy curtain of screaming anguish on proceedings with distorted vocals tearing across a rumbling bassline and savage guitars.

There’s a desperation and urgency about Sterilize which ensures that it crackles from beginning to end. Everything seethes, spits and scrapes and there’s not a moment’s relief. It’s this intensity which makes Sterilize as strong as any Unsane release. It’s mercilessly harrowing, but is ultimately satisfying in a perverse, sadistic sense.